CGLib Proxy for Integer (Final class) in Spring MVC
I need such a usage:
For each request I want to inject userId into DemoController But because of being a final class without empty constructor I can not inject it. What is the best practice in such cases? A service with request scope is fine?
@Configuration
public class CityFactory{
@Bean(name = {"currentUserId")
@Scope(value = WebApplicationContext.SCOPE_REQUEST,proxyMode = ScopedProxyMode.TARGET_CLASS)
@Autowired
public Integer getUserId(HttpServletRequest request) {
return UserUtil.getCurrentUserId(request.getServerName());
}
}
@RequestMapping("/demo")
@Controller
public class DemoController {
@Autowired
Ingeter userId;
@RequestMapping(value = "/hello/{name}", method = RequestMethod.GET)
public ModelAndView helloWorld(@PathVariable("name"开发者_JAVA技巧) String name, Model model) {
Map<String, Object> myModel = new HashMap<String, Object>();
model.addAttribute("user", userId);
return new ModelAndView("v3/test", "m", model);
}
}
Your best bet is to create an explicit class called UserId
, which in turn contains an integer. Not only will this play nicer with CGLIB's proxying, it also clarifies your design.
You can use Supplier or Provider
@Configuration
public class CityFactory{
@Bean
@Autowired
public Supplier<Integer> getUserId(HttpServletRequest request) {
return () -> UserUtil.getCurrentUserId(request.getServerName());
}
}
@RequestMapping("/demo")
@Controller
public class DemoController {
@Autowired
Supplier<Ingeter> getUserId;
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